yet the clashes reveal al qaeda said mostly to be across the border in pakistan is again a concern, back where they started in afghanistan's hills. we push down into the valley, still an insurgent strong hold. high tech american attack helicopters buzzed overyaed until militants shot from them from the valley. >> it's uncharacteristic from the taliban. they're getting pretty gutsy. if you push up any farther past that, you're going to take enemy contact, that's pretty certain. >> the afghans clear about who lay in wait ahead of them. >>. >> translator: it's very draws, taliban, arabs, pakistanis there. >> at the foot of valley, the american base is often hit by pot shots, sometimes from lone gunmen up high who they then mortar. >> al qaeda's return to these remote hills could tie america's hands, making it harder to justify pulling back from here. the terrorist network that made america's case for invading slipping back in, just when america makes its case to leave. >>> president obama is urging congressional negotiators to be open mined when he sits down with them at the white house tom